{"currentpage":1,"firstResult":0,"maxresult":10,"pagecode":5,"pageindex":{"endPagecode":5,"startPagecode":1},"records":[{"abstractinfo":"负载型 Au基催化剂在工业过程中具有非常广泛的潜在应用,如催化加氢/脱氢过程、精细化学品合成、能源催化转化及环境保护等过程,表现出很高的催化活性和选择性. Au基催化剂活性物种或活性中心基本由纳米粒子或化合物构成,但在应用过程中因 Ostwald熟化效应或粒子迁移作用,尤其是高温高压等苛刻反应条件下,均随应用时间延长从小尺寸粒子逐渐长为大粒子,造成活性降低或完全失活,这也是负载型催化剂失活的最主要原因之一.其中因成本、稀缺等特性,负载型 Au催化剂的烧结问题是影响和制约其应用的主要因素.除可通过载体改性、助剂和官能团配位稳定等方法来延缓其失活过程外,对已烧结催化剂的高效、快捷和绿色的再分散/再生过程也具有基础和应用研究的重要意义.活性炭载 Au催化剂(Au/AC)广泛应用于乙炔氢氯化反应中,以期替代高毒性的汞基催化剂,但在反应过程中因高活性的 Au3+物种易被还原而形成 Au0物种进而烧结导致失活;如新鲜 Au/AC催化剂表面的 Au粒子尺寸为1-2 nm,经乙炔氢氯化反应后变为33 nm左右;随之在453 K、0.1 MPa、乙炔体积空速(GHSV)为600 h-1、氯化氢与乙炔摩尔比为1.1的反应条件下,乙炔转化率从81.8%降至11.2%.如何有效对大粒子 Au再分散/再生可为其应用提供有力支撑.有研究表明,气相 CH3I在甲醇羰基化反应过程中明显改变 Au/AC表面的 Au粒子尺寸;或采用浓盐酸或王水也可将烧结的 Au/AC催化剂进行再分散/再生.但已有的 Au基催化剂再分散/再生过程均伴随着强酸、强氧化或高毒性在分散剂的应用,对环境的影响及后续处理有明显的局限性,且再分散机理尚不明确.在前期工作基础上,本文采用系列卤代烃(碘代烃、溴代烃和氯代烃)对烧结的 Au/AC进行再分散/再生研究.结果表明,在室温常压条件下 CHI3可以快捷高效地对烧结 Au/AC催化剂进行再分散/再生,具有最优的再分散性能;通过对系列碘代烃 C-I键的解离能分析,发现 C-I解离能越低越有利于大粒子 Au的再分散.同时,溴代烃和氯代烃对烧结的 Au/AC催化剂也具有再分散能力,但比碘代烃的再分散效率低. C-X键的解离能与再分散效率有高相关性,即 C-X键的解离能越低越有利于 Au的再分散.总体上,三类卤代烃再分散效率高低顺序为 C-I>C-Br>C-Cl.进而,通过不同分散过程中 Au粒子分散状态推测了卤代烃对 Au粒子的再分散机理,即卤代烃先在 Au粒子表面化学吸附,然后 C-X键解离,形成 Au-X物种,小粒子 Au在 AC表面聚集并稳定,最后形成高分散 Au粒子(粒径<1 nm)催化剂.以乙炔氢氯化反应考察了再生 Au/AC催化剂性能,结果表明,该催化剂上乙炔转化率可达79.4%,基本恢复至初始水平,且该方法可对失活催化剂进行多次高效再生.","authors":[{"authorName":"段新平","id":"06b6d747-db60-4308-bf6d-542b60c6e4d8","originalAuthorName":"段新平"},{"authorName":"尹燕","id":"340bf0b7-6ba7-4bf9-98e7-4dbaaafa1238","originalAuthorName":"尹燕"},{"authorName":"田学林","id":"d4f4a827-562c-4d77-a3ee-f04da9d1cb8b","originalAuthorName":"田学林"},{"authorName":"柯金火","id":"ff98cd37-9985-4a2d-b33f-f972fe66e439","originalAuthorName":"柯金火"},{"authorName":"温兆军","id":"30bf413d-dc68-45ab-9071-55bd762eb462","originalAuthorName":"温兆军"},{"authorName":"郑建伟","id":"0e3e4524-1903-4080-8f48-810ac0df1465","originalAuthorName":"郑建伟"},{"authorName":"胡梦麟","id":"1ee1caf3-b376-4c6d-8dff-bc1b42ff2ab4","originalAuthorName":"胡梦麟"},{"authorName":"叶林敏","id":"7f9cc708-a960-42b5-bbb8-83fcec270132","originalAuthorName":"叶林敏"},{"authorName":"袁友珠","id":"425cc946-2a56-472c-aa6d-22d6cca8b09c","originalAuthorName":"袁友珠"}],"doi":"10.1016/S1872-2067(16)62500-7","fpage":"1794","id":"2b2717d5-7405-455e-8e0a-6e42fec4aaae","issue":"10","journal":{"abbrevTitle":"CHXB","coverImgSrc":"journal/img/cover/CHXB.jpg","id":"18","issnPpub":"0253-9837","publisherId":"CHXB","title":"催化学报 "},"keywords":[{"id":"e09b1d4c-00b0-48ff-a605-7456b5abd96f","keyword":"金","originalKeyword":"金"},{"id":"16bdd5fd-6b44-42e0-b457-8b4c54ca6fa5","keyword":"纳米粒子","originalKeyword":"纳米粒子"},{"id":"68dedca9-3d15-4cb9-9d03-1deb1473f465","keyword":"再分散","originalKeyword":"再分散"},{"id":"eb722f15-aaee-4ecd-8941-8564a32daccb","keyword":"卤代烃","originalKeyword":"卤代烃"},{"id":"6489e4ba-7299-4fce-9aeb-5c2dfe8d18ef","keyword":"乙炔氢氯化","originalKeyword":"乙炔氢氯化"}],"language":"zh","publisherId":"cuihuaxb201610026","title":"C-X(X = Cl,Br,I)键解离能作为烧结Au/AC催化剂再分散的描述因子及相关蕴意","volume":"37","year":"2016"},{"abstractinfo":"称取一定量的载金炭进行火试金配料,经过熔炼、灰吹得到金银合粒,使用硝酸分金得到金粒,再通过计算得到载金炭中银含量,从而建立了火试金重量法测定载金炭中银含量的方法.经过试验,确定了火试金配料中试样量、氧化铅加入量、灰吹温度等最佳试验条件.根据目前国内载金炭的生产水平,在载金炭国家标准物质加入一定量的共存元素,进行了银量测定的干扰试验,结果表明载金炭中共存元素(Cu、Fe、Pb、Cd、Zn、Bi、Cr、Ca、Mg、As)对银测定无影响.将方法用于3个载金炭国家标准物质中银的测定,测定值与认定值基本吻合,相对标准偏差(RSD,n=11)为0.82%~4.2%.","authors":[{"authorName":"夏珍珠","id":"ae2def66-61f8-4a33-8789-5dec712b132d","originalAuthorName":"夏珍珠"}],"doi":"10.13228/j.boyuan.issn1000-7571.010052","fpage":"54","id":"4b8246f5-46d3-4c21-add1-aec3ad1a51f6","issue":"2","journal":{"abbrevTitle":"YJFX","coverImgSrc":"journal/img/cover/YJFX.jpg","id":"71","issnPpub":"1000-7571","publisherId":"YJFX","title":"冶金分析 "},"keywords":[{"id":"47d546ce-8dc2-4590-a95d-577be2bda394","keyword":"载金炭","originalKeyword":"载金炭"},{"id":"d39a523e-9fce-4000-9dc3-679e231f7a0a","keyword":"银","originalKeyword":"银"},{"id":"4fe9ac55-04a7-4da9-9b38-d814d71ea793","keyword":"火试金","originalKeyword":"火试金"}],"language":"zh","publisherId":"yjfx201702011","title":"火试金重量法测定载金炭中银","volume":"37","year":"2017"},{"abstractinfo":"采用样品与试剂混合, 直接在灰皿中进行熔融、灰吹,合粒用硝酸分解,火试金法测定树脂中的金.实验结果表明,该方法对测定树脂中的金具有较好的准确度,相对标准偏差为1.27 %.","authors":[{"authorName":"李小玲","id":"b12237c4-4d34-445c-b77f-18d61ac74404","originalAuthorName":"李小玲"}],"doi":"10.3969/j.issn.1001-1277.2010.04.015","fpage":"54","id":"e10aef27-91ba-40dc-b6e0-852bef8a2b4f","issue":"4","journal":{"abbrevTitle":"HJ","coverImgSrc":"journal/img/cover/HJ.jpg","id":"44","issnPpub":"1001-1277","publisherId":"HJ","title":"黄金"},"keywords":[{"id":"0a96019f-9436-44b9-9da4-e15ec8bce2d1","keyword":"火试金法","originalKeyword":"火试金法"},{"id":"3bf169fe-5d80-47b4-8de5-b27501454c8d","keyword":"树脂","originalKeyword":"树脂"},{"id":"e554c720-bf1e-47a1-ba42-5a3891e30487","keyword":"金","originalKeyword":"金"}],"language":"zh","publisherId":"huangj201004015","title":"火试金法测定树脂中的金","volume":"31","year":"2010"},{"abstractinfo":"根据史料分析,叙述了火试金法在中国古代的产生和发展.表明用火试金法冶炼和鉴定金、银,在中国古代早已有之.","authors":[{"authorName":"杨丙雨","id":"de4e3d7f-2e32-4b06-b431-d07e5484b7e4","originalAuthorName":"杨丙雨"},{"authorName":"冯玉怀","id":"a7e0c981-6d6e-45ad-9b5b-7f530cfaebf4","originalAuthorName":"冯玉怀"}],"doi":"10.3969/j.issn.1004-0676.2009.01.012","fpage":"59","id":"fcee5770-7794-4f12-8385-325a24f3c6b2","issue":"1","journal":{"abbrevTitle":"GJS","coverImgSrc":"journal/img/cover/GJS.jpg","id":"38","issnPpub":"1004-0676","publisherId":"GJS","title":"贵金属"},"keywords":[{"id":"ee16f9c7-f391-4254-9f53-d6f4792797ca","keyword":"分析化学","originalKeyword":"分析化学"},{"id":"6a5f0f63-2c03-42fd-8a58-b9e6c3097bd5","keyword":"火试金法","originalKeyword":"火试金法"},{"id":"8fb73f49-37ee-418d-bd61-fefcd75d39dc","keyword":"金、银","originalKeyword":"金、银"},{"id":"a7de8333-7ea6-4032-8bd2-e354e1c2d9aa","keyword":"中国古代","originalKeyword":"中国古代"}],"language":"zh","publisherId":"gjs200901012","title":"中国古代的火试金法","volume":"30","year":"2009"},{"abstractinfo":"近代火试金分析技术明末传入中国至今已近400年,由于明末的社会动乱和清中叶的拒外闭关政策,使初入中国的该技术未流传就被扼杀.鸦片战争后,经过洋务运动,又使火试金分析技术在中国起死回生,逐渐孕育和萌芽.辛亥革命和新文化运动推动了近代火试金分析法在中国的诞生和传播.新中国的成立,为火试金分析的普及、提高、创新提供了发展的条件,使该法深深的扎根于中国本土并发扬光大,现已成为分析贵金属的一种完善方法.","authors":[{"authorName":"杨丙雨","id":"c1a066ac-4f3b-4f97-a86e-0f2f60b751ff","originalAuthorName":"杨丙雨"},{"authorName":"马亚丽","id":"b1410b4a-684d-4c44-9ddf-017075d2c772","originalAuthorName":"马亚丽"}],"doi":"10.3969/j.issn.1004-0676.2010.01.011","fpage":"43","id":"32b6983b-fa77-47b1-9aa5-f7d4dc805a81","issue":"1","journal":{"abbrevTitle":"GJS","coverImgSrc":"journal/img/cover/GJS.jpg","id":"38","issnPpub":"1004-0676","publisherId":"GJS","title":"贵金属"},"keywords":[{"id":"ff651b86-0d55-4909-b8fd-334f04ff65d5","keyword":"分析化学","originalKeyword":"分析化学"},{"id":"b7576bca-4cf5-4af2-b342-8ce31eb34094","keyword":"贵金属","originalKeyword":"贵金属"},{"id":"c15f4477-a557-4376-bd3f-f81f2e133c71","keyword":"火试金分析法","originalKeyword":"火试金分析法"},{"id":"b0692ce0-3569-4f64-ab1b-9b9ccb8b8736","keyword":"流传和发展","originalKeyword":"流传和发展"},{"id":"1b538b54-c3fc-472b-8ecd-b3958071244f","keyword":"中国","originalKeyword":"中国"}],"language":"zh","publisherId":"gjs201001011","title":"近代火试金分析在中国的传播","volume":"31","year":"2010"},{"abstractinfo":"采用加Au的方法解决火试金测Ag时灰吹合粒\"开花\"的问题,讨论了Au的加入量与Ag回收率的关系,此法测Ag快速和简便准确.","authors":[{"authorName":"管有祥","id":"4d86f294-dd88-450f-8db6-4f225df5fa6e","originalAuthorName":"管有祥"}],"doi":"10.3969/j.issn.1004-0676.1999.01.010","fpage":"42","id":"19d9b7c4-6131-476e-8f4c-1eceb3b36c33","issue":"1","journal":{"abbrevTitle":"GJS","coverImgSrc":"journal/img/cover/GJS.jpg","id":"38","issnPpub":"1004-0676","publisherId":"GJS","title":"贵金属"},"keywords":[{"id":"a2f1d50d-e12e-428d-bf37-a7a693185f19","keyword":"火试金","originalKeyword":"火试金"},{"id":"e4f5151b-d8a8-4c7e-a659-9458fa2c8ad9","keyword":"\"开花\"","originalKeyword":"\"开花\""},{"id":"3bd95d8c-f3e0-4194-96a4-0785bc68d6f3","keyword":"加Au","originalKeyword":"加Au"}],"language":"zh","publisherId":"gjs199901010","title":"火试金灰吹合粒\"开花\"的讨论","volume":"","year":"1999"},{"abstractinfo":"研究了铅扣中铜对钯灰吹时的影响及铅扣中铜、氧化铅和硅酸度(K)三者间的关系.提出了对粗铜样品不经预先分离铜而直接进行火试金,连续测定样品中的金和钯量.方法准确,精密度高.","authors":[{"authorName":"林海山","id":"0b885736-1497-475f-9911-bc7cebb939ef","originalAuthorName":"林海山"}],"doi":"10.3969/j.issn.1000-7571.2002.01.020","fpage":"53","id":"2315ff49-3b90-40b7-a5b2-1a9030c429c8","issue":"1","journal":{"abbrevTitle":"YJFX","coverImgSrc":"journal/img/cover/YJFX.jpg","id":"71","issnPpub":"1000-7571","publisherId":"YJFX","title":"冶金分析 "},"keywords":[{"id":"58627cbd-6788-497b-aba2-7e3baf6aafac","keyword":"火试金","originalKeyword":"火试金"},{"id":"2935a686-14d6-421e-8658-d7872a47202e","keyword":"粗铜","originalKeyword":"粗铜"},{"id":"d0d0d571-57f9-46b7-a47d-00d06bf48c7b","keyword":"试金配料","originalKeyword":"试金配料"},{"id":"013a59d4-5140-41e5-82cf-d77e31008e95","keyword":"金","originalKeyword":"金"},{"id":"54344541-ab47-4cbc-b6c7-e92e20441e37","keyword":"钯","originalKeyword":"钯"}],"language":"zh","publisherId":"yjfx200201020","title":"火试金法测定粗铜中金和钯","volume":"22","year":"2002"},{"abstractinfo":"建立了样品焙烧处理—火试金重量法测定载金炭中的金量;经过了一系列条件实验,分别确定了称样量范围、焙烧温度、配料、熔样温度、分金时间、分金酸度及金银质量比例等最佳实验条件.在最佳实验条件下,该方法加入标准物质的回收率为99.85 %~100.1%,与原子吸收光谱法对比,体现了更好的重复性和再现性.在载金炭交易中,该方法被推荐为仲裁分析方法.","authors":[{"authorName":"马丽军","id":"6768dfdb-3530-488a-9d93-1f0ab30c47fa","originalAuthorName":"马丽军"},{"authorName":"陈永红","id":"5ac59b89-d7d2-4dea-9c22-e5e9e2151d26","originalAuthorName":"陈永红"},{"authorName":"腾飞","id":"6d20e110-9155-40fb-9f55-e990679138be","originalAuthorName":"腾飞"},{"authorName":"芦新根","id":"1ce113b3-6ebb-4ed5-b1b0-d68573b7c776","originalAuthorName":"芦新根"}],"doi":"10.11792/hj20131118","fpage":"68","id":"031dab89-a481-4201-bcbf-680191560ad2","issue":"11","journal":{"abbrevTitle":"HJ","coverImgSrc":"journal/img/cover/HJ.jpg","id":"44","issnPpub":"1001-1277","publisherId":"HJ","title":"黄金"},"keywords":[{"id":"27a49c13-1b1f-40cb-8b6d-4d6a1cac9063","keyword":"载金炭","originalKeyword":"载金炭"},{"id":"fe57d337-dd21-4f75-b6f6-8d875f4cc7fc","keyword":"金","originalKeyword":"金"},{"id":"cd477d2b-4419-4c19-97b5-7ef553f579a0","keyword":"火试金","originalKeyword":"火试金"},{"id":"13f56eb7-08cc-46f3-96e9-e3789e6a9687","keyword":"重量法","originalKeyword":"重量法"}],"language":"zh","publisherId":"huangj201311018","title":"火试金重量法测定载金炭中的金量","volume":"34","year":"2013"},{"abstractinfo":"对锡含量高的Sn-Pb-Au-Sb合金中金含量的火试金测定,作者采用熔炼、灰吹手段,解决了Sn干扰测定结果的问题.具体的作法是,用碳酸钠和硼砂配制成混合熔剂,将该混合熔剂与合金试样混合,经高温熔炼,使Sn转变成锡酸钠造渣而不进入铅扣,试样经灰吹富集形成Au-Ag合金.用硝酸分Ag,重量法测Au.合成样回收率99.93%~100.09%,相对标准偏(RSD%)为0.369%.","authors":[{"authorName":"管有祥","id":"fe6bad56-f481-4d99-9b53-24558e8e2406","originalAuthorName":"管有祥"},{"authorName":"温结胜","id":"4aef01a5-19c1-43f0-b078-b9d9084e220d","originalAuthorName":"温结胜"},{"authorName":"甘建壮","id":"d1e0bdfa-088f-4af3-b6a7-f369765942e3","originalAuthorName":"甘建壮"},{"authorName":"段颖","id":"48729570-54f7-43f9-9540-9ea9c4fefa9c","originalAuthorName":"段颖"}],"doi":"10.3969/j.issn.1004-0676.2005.04.008","fpage":"31","id":"1618c192-81b9-418b-9dcc-972426c1a7b5","issue":"4","journal":{"abbrevTitle":"GJS","coverImgSrc":"journal/img/cover/GJS.jpg","id":"38","issnPpub":"1004-0676","publisherId":"GJS","title":"贵金属"},"keywords":[{"id":"ce5ba970-71f5-40b2-87aa-0a8e097c7726","keyword":"分析化学","originalKeyword":"分析化学"},{"id":"1d9ad7ac-ec19-49b4-8f28-40c6337dc943","keyword":"火试金法","originalKeyword":"火试金法"},{"id":"e1f11ab5-75bb-4605-8147-30474f04cea4","keyword":"锡铅金锑合金","originalKeyword":"锡铅金锑合金"},{"id":"5188de92-47fe-49a8-af1b-fd9e997c99de","keyword":"金含量","originalKeyword":"金含量"}],"language":"zh","publisherId":"gjs200504008","title":"火试金测定锡铅金锑合金中金含量","volume":"26","year":"2005"},{"abstractinfo":"文中针对含有碳酸盐及金属氧化物硅酸盐的含金富矿块火试金分析测定方法在配料上进行了研究,提出了二硅酸度及造渣成分为53%硅酸盐、33%硼酸盐、14%铅酸盐的面粉法配料方案.该方法使熔渣具有熔点低、流动性好等物理性能,从而使金捕收率高达99.95%,且测定结果重现性好.","authors":[{"authorName":"曹永刚","id":"f6e49d6e-295d-4c97-a7f2-7ebfd49deea7","originalAuthorName":"曹永刚"}],"doi":"10.3969/j.issn.1001-1277.2005.10.015","fpage":"45","id":"85131bff-4c76-4ebb-a7e0-bdb88df0ea48","issue":"10","journal":{"abbrevTitle":"HJ","coverImgSrc":"journal/img/cover/HJ.jpg","id":"44","issnPpub":"1001-1277","publisherId":"HJ","title":"黄金"},"keywords":[{"id":"b60eb429-c22f-4829-a23b-7d178bbac384","keyword":"含金富矿块","originalKeyword":"含金富矿块"},{"id":"649d9b17-5e50-476e-8c13-12b96d7eb671","keyword":"面粉法","originalKeyword":"面粉法"},{"id":"c7959c1a-305d-4ebc-9dd4-5fb794ea0daf","keyword":"硝石法","originalKeyword":"硝石法"},{"id":"033d3998-5f0a-4fcc-a7ee-f6efcf8a7d62","keyword":"硅酸度","originalKeyword":"硅酸度"}],"language":"zh","publisherId":"huangj200510015","title":"含金富矿块火试金法配料的探讨","volume":"26","year":"2005"}],"totalpage":292,"totalrecord":2919}