±±¾©Ê¯ÓÍ»¯¹¤Ñ§Ôº2026ÄêÑо¿ÉúÕÐÉú½ÓÊÕµ÷¼Á¹«¸æ
²é¿´: 266  |  »Ø¸´: 1
µ±Ç°Ö÷ÌâÒѾ­´æµµ¡£

billduke

½ð³æ (ÖøÃûдÊÖ)

[½»Á÷] ¡¾ÇóÖú¡¿Çë½Ì²Î¿¼ÎÄÏ×ÖлáÒéÂÛÎĸñʽÊéд¹æÔò

ÇëÎÊÎÒÔõôÔڲο¼ÎÄÏ×ÀïÒýÓÃÏÂÃæµÄ»áÒéÂÛÎÄ£¿¸ñʽÊÇÔõôдµÄ?лл´ó¼ÒÁË£¡
Studies in Surface Science and Catalysis
Volume 34, 1987, Pages 523-534
Catalyst Deactivation 1987, Proceedings of the 4th International Symposium

Copyright © 1987 Elsevier Science Publishers B.V. Published by Elsevier B.V.
The Effect of Partial Reduction on the Thioresistance of Ni/Al2O3 Catalysts

D. Dupreza and M. Mendeza
aLaboratoire de Catalyse en Chimie Organique, UA CNRS 350, 40, Av. Recteur Pineau 86022 POITIERS CEDEX FRANCE


Available online 4 January 2009.

Abstract

The effect of partial reduction on the thioresistance of the metals was evaluated on two series of nickel catalysts. The first series, comprising Ni/Al2O3 samples with variable metal loading (2 to 12 wt%) were characterized (metal area, degree of reduction), using two different methods: chemisorption of gases (H2, O2) and magnetism. Despite some discrepancies between the two methods of characterisation, it can be concluded that the presence of an unreduced phase improves the thioresistance of nickel, expressed as the number of molecules of thiophen required for deactivating one atom of surface nickel. For increasing the amount of unreduced nickel, a second series of catalysts was prepared by impregnation of nickel on NiO-Al2O3 supports (pre-spinelised at 700¡ãC). As a result, the catalysts were found to be particularly resistant to sulphur poisoning. In turn, three hypothesis were considered to interpret these results: trapping effects of sulphur by unreduced nickel species of the support, electronic effects (Ni¡ã-Ni2+ interactions) and geometric effects (dilution of the nickel surface by unreduced species). Complementary experiments (measurement of sulphur capacity by H2S chemisorption and evolution of electronic interaction by competitive hydrogenation) were used to clarify these interpretations. Trapping effects are likely but not sufficient to account for the improvment of thioresistance, which could be due also to geometric effects.
»Ø¸´´ËÂ¥
ÌÆºººè»ù£¬£Ì£Ì±Ìº£À¶Ì죡
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

mland

ľ³æ (ÖøÃûдÊÖ)

¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
^_^@^_^(½ð±Ò+1,VIP+0):¹þ¹þ£¬ºÃ¾Ãû¼ûÀÏÐÖµÄÉíÓ°¡£½üÀ´¿É棿 6-10 16:55
billduke(½ð±Ò+3,VIP+0):»¹ºÃ 7-22 15:26
billduke(½ð±Ò+3,VIP+0):------------ 7-31 10:20
àÅ£¬Õâ¸öÒª¿´ÄãÏë·¢±íµÄÆÚ¿¯ËùÔÚµÄÊý¾Ý¿âµÄÒªÇóÁË

·­ÁËϵçÄÔ£¬¸ø¼¸¸öÀý×Ó°É
1¡¢ Ó¢¹ú»Ê¼Òѧ»á£¨RSC£©µÄJ . Ma t e r . C h em. , 2 0 0 4 , 1 4 , 1 5 7 9 ¨C 1 5 8 4µÄ²Î¿¼ÎÄÏ×12д·¨ÎªL. Qi, J. Ma, H. Cheng and Z. Zhao, Stud. Surf. Sci. Catal., 2000, 129, 37.

2¡¢ElsevierµÄMicroporous and Mesoporous Materials 94 (2006) 269¨C276µÄ²Î¿¼ÎÄÏ×[21] Q. Luo, L. Li, Z. Xue, D. Zhao, Stud. Surf. Sci. Catal. 129 (2000) 37.
2Â¥2009-06-10 16:28:56
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ billduke µÄÖ÷Ìâ¸üÐÂ
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] 324Çóµ÷¼Á +5 ÏëÉÏѧÇóµ÷ 2026-04-01 6/300 2026-04-02 10:16 by sanrepian
[¿¼ÑÐ] 286·Öµ÷¼Á +18 Faune 2026-03-30 20/1000 2026-04-01 21:37 by 495374996
[¿¼ÑÐ] 286Çóµ÷¼Á +5 lim0922 2026-03-26 5/250 2026-04-01 19:08 by ¿Í¶ûÃÀµÂ
[¿¼ÑÐ] Ò»Ö¾Ô¸±±½»²ÄÁϹ¤³Ì×Ü·Ö358 +5 cs0106 2026-04-01 7/350 2026-04-01 11:45 by wangjy2002
[¿¼ÑÐ] 085410È˹¤ÖÇÄÜ ³õÊÔ316·Ö Çóµ÷¼Á +3 ²ÐÐÇ·÷Êï 2026-03-31 3/150 2026-04-01 11:09 by СÐÜraider
[¿¼ÑÐ] Ò»Ö¾Ô¸ÄÏʦ´ó0703»¯Ñ§ 275Çóµ÷¼Á +5 RipcordÉϰ¶ 2026-03-27 5/250 2026-03-31 19:52 by mg1014
[¿¼ÑÐ] ÕÅ·¼Ãú-Öйúũҵ´óѧ-»·¾³¹¤³Ìר˶-298 +9 ÊÖ»úÓû§ 2026-03-26 9/450 2026-03-31 18:09 by 544594351
[¿¼ÑÐ] Çóµ÷¼Á ÉúÎïѧ 377·Ö +6 zzll03 2026-03-31 6/300 2026-03-31 17:33 by ÌÆãå¶ù
[¿¼ÑÐ] 085601 329·Öµ÷¼Á +6 yzsa12 2026-03-31 6/300 2026-03-31 15:23 by yanflower7133
[¿¼²©] ²ÄÁÏרҵÉ격 +5 ¶ÅÓêæÃdyt 2026-03-29 5/250 2026-03-31 11:19 by oooqiao
[¿¼ÑÐ] 22408 359·Öµ÷¼Á +4 Qshers 2026-03-27 8/400 2026-03-31 08:53 by Qshers
[¿¼ÑÐ] 08¹¤¿ÆÇóµ÷¼Á286 +5 tgs_001 2026-03-28 5/250 2026-03-31 08:18 by Ò»Ö»ºÃ¹û×Ó?
[¿¼ÑÐ] 083000»·¾³¿ÆÑ§Ó빤³Ìµ÷¼Á£¬×Ü·Ö281 +4 ³È×Ó£¨Ê¤Ò⣩ 2026-03-30 4/200 2026-03-31 00:44 by Linzejun
[¿¼ÑÐ] 328Çóµ÷¼Á +8 àŵεĻù±¾¶¼ 2026-03-27 8/400 2026-03-30 17:20 by Wang200018
[¿¼ÑÐ] ¿¼Ñе÷¼Á +5 Sanmu-124 2026-03-26 5/250 2026-03-30 13:36 by chemdavid
[¿¼ÑÐ] 296Çóµ÷¼Á +10 ±Ë°¶t 2026-03-29 10/500 2026-03-30 10:50 by ̽123
[¿¼ÑÐ] 291Çóµ÷¼Á +5 Y-cap 2026-03-29 6/300 2026-03-29 13:18 by mumin1990
[¿¼ÑÐ] 394Çóµ÷¼Á +3 ºÃʶàÄ¥¾²ºò¼ÑÒ 2026-03-26 5/250 2026-03-28 14:24 by ÌÆãå¶ù
[¿¼ÑÐ] 081200-314 +3 LILIQQ 2026-03-27 4/200 2026-03-28 09:41 by ±£»¤µØÇòÄãÎÒ×öÆ
[¿¼ÑÐ] 292Çóµ÷¼Á +4 ÇóÇóÁËÊÕÏÂÎÒ°É£ 2026-03-26 4/200 2026-03-27 10:37 by zhshch
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û