主题：【求助】求助文章4篇（缺1，2）

1
作者：J. Cai
题目： Effects of Formic Acid and CO 2 in  CO  Hydrogenation to  Methanol  Over Copper-Based Catalysts and Nature of  Active Sites *

来源： Studies in Surface Science and Catalysis
Volume 75, Part 3, 1993, Pages 2769-2772
链接：
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B8GYB-4T2BBNK-7T&_user=1002870&_coverDate=12%2F31%2F1993&_alid=851866246&_rdoc=40&_fmt=high&_orig=search&_cdi=42462&_sort=d&_st=4&_docanchor=&_ct=43&_acct=C000050160&_version=1&_urlVersion=0&_userid=1002870&md5=a6719bc2472786b26d3b6bef0278617b

2
作者：E.M. Calverley
题目： The direct source of carbon in ethanol formation over promoted copper catalysts
来源： Studies in Surface Science and Catalysis
Volume 73, 1992, Pages 111-118
链接：http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B8GYB-4S80MPD-R&_user=1002870&_coverDate=12%2F31%2F1992&_alid=851866246&_rdoc=43&_fmt=high&_orig=search&_cdi=42462&_sort=d&_st=4&_docanchor=&_ct=43&_acct=C000050160&_version=1&_urlVersion=0&_userid=1002870&md5=63ac5c70e7a92a01500db5f9f3a3b3aa

3
作者：Jarosław Handzlik
题目： Active sites of olefin metathesis on molybdena-alumina system: A periodic DFT study

来源： Journal of Catalysis
Volume 256, Issue 1, 15 May 2008, Pages 1-14

链接：http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WHJ-4S7HWP5-1&_user=1002870&_coverDate=05%2F15%2F2008&_alid=851872625&_rdoc=5&_fmt=high&_orig=search&_cdi=6852&_sort=d&_docanchor=&view=c&_ct=84&_acct=C000050160&_version=1&_urlVersion=0&_userid=1002870&md5=abf317629c120a546f3d1c459ce087ae

4
作者：Ruiqin Yang
题目：A new method of low-temperature methanol  synthesis on  Cu/ ZnO/Al2O3 catalysts from  CO/CO 2/H2 

来源： Fuel
Volume 87, Issues 4-5, April 2008, Pages 443-450
链接：http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V3B-4P8H76N-2&_user=1002870&_coverDate=04%2F30%2F2008&_alid=851866246&_rdoc=3&_fmt=high&_orig=search&_cdi=5726&_sort=d&_st=4&_docanchor=&_ct=43&_acct=C000050160&_version=1&_urlVersion=0&_userid=1002870&md5=bb01affe4124d101ebdccfdc3063dd4d