一本加勒比hezyo无码视频,久久久久波多野结衣高潮,久久久久波多野结衣高潮,97人妻视频妓女网,最新免费视频一区二区三区,中文字幕无码无码专区,亚洲精品亚洲人成在线观看,亚洲熟妇av一区二区三区漫画
手機版

掃一掃,手機訪問

關于我們 加入收藏

麥克默瑞提克(上海)儀器有限公司

15 年金牌會員

已認證

撥打電話
獲取底價
提交后,商家將派代表為您專人服務
立即發送
點擊提交代表您同意 《用戶服務協議》
當前位置:
美國麥克儀器 >公司動態 >

每周分享

每周分享
美國麥克儀器  2014-09-12  |  閱讀:1725

手機掃碼查看

~今天給大家分享的是2014年1月份 《Applied Catalysis A: General》上發表的一篇名為:Selective hydrogenation of acetylene in excess ethylene using Ag- and Au–Pd/SiO2 bimetallic catalysts prepared by electroless deposition

文章摘要如下:

Selective hydrogenation of acetylene in excess ethylene has been investigated for a series of Ag- and Au–Pd/SiO2 bimetallic catalysts having incremental surface coverages of Ag and Au on the Pd surface. The catalysts were prepared by electroless deposition and characterized by atomic absorption spectroscopy and selective chemisorption. Both Ag- and Au–Pd/SiO2 catalysts showed increased selectivity of acetylene conversion to form ethylene, rather than ethane, at high coverages. The catalyst performance results suggest that at high coverages of Ag or Au on Pd, that result in small ensembles of Pd sites, acetylene is adsorbed as a π-bonded species that favors hydrogenation to ethylene. At low coverages, where ensemble sizes of contiguous Pd surface sites are much larger, acetylene is strongly adsorbed as a multi-σ-bonded species which preferentially forms ethane, lowering the selectivity to ethylene. Both kinetic analyses and the calculated turnover frequencies of acetylene conversion and ethane formation were consistent with the above explanation. The similar performance trends for Ag- and Au–Pd/SiO2 suggest that the bimetallic effect for these catalysts is geometric and not electronic in nature.

該文章中材料表征采用的是美國麥克儀器AutoChem 2920

詳情可參考下面鏈接:

留言咨詢
(我們會第一時間聯系您)
關閉
留言類型:
     
*姓名:
*電話:
*單位:
Email:
*留言內容:
(請留下您的聯系方式,以便工作人員及時與您聯系!)
久久久www免费人成精品| 女人被躁到高潮嗷嗷叫免费软| 国产成人亚洲精品无码青| 激情综合色五月丁香六月亚洲| 人妻插b视频一区二区三区| 免费的黄网站精品久久| 毛片最新网址| 爆乳喷水免费无ma区手机免费观看| 国产乱来乱子视频| 99精品久久99久久久久胖女人 | 久久黄色蜜桃av一区| 成人a免费α片在线视频网站| 亚洲国产cao| 久本草在线中文字幕亚洲| 后入内射无码人妻一区| 99精品久久毛片a片| 中文字幕无码精品亚洲35| 国产午夜伦鲁鲁| 美女张开腿黄网站免费| 中国国语毛片免费观看视频 | 在线观看视频亚洲| 欧美人与禽zoz0性伦交| 97在线观看播放| 亚洲中文字幕无码中文字在线| 精品福利视频一区二区三区| 女人大荫蒂毛茸茸视频| 久久精品这里就是精品| 浪荡少妇一区二区三区| av天堂在线视频播放| 午夜精品福利影院| 波多野结衣一二三| 亚洲天堂精品日本| 亚洲色大成网站www应用| 国产91 对白在线播放九色| 国产玉足榨精视频在线观看| 精品国产一区二区三区四区vr | 特级免费毛片| 亚洲亚洲网站三级片在线| 精品无人区卡卡二卡三乱码| 中国无码人妻丰满熟妇啪啪软件 | 好屌草这里只有精品|