共查询到20条相似文献,搜索用时 14 毫秒
1.
以富马酸和甲醇为原料 ,用活性炭固载磷钨酸催化合成富马酸二甲酯 (DMF)。讨论了催化剂用量、醇酸比、反应时间、反应温度等对合成DMF的影响。结果表明 ,该催化剂具有较高的活性、可重复使用 ,后处理容易 ,生产成本低且无三废污染。 相似文献
2.
Jun Sun Mingyuan Zheng Xiaodong Wang Aiqin Wang Ruihua Cheng Tao Li Tao Zhang 《Catalysis Letters》2008,123(1-2):150-155
Activated carbon (AC) supported tungsten carbide was reported for the catalytic decomposition of hydrazine for the first time. It was found that the WC x /AC-H catalyst prepared by a carbothermal hydrogen reduction process exhibited excellent catalytic performances both in the microreactor and in a 1 Newton hydrazine microthruster. The XRD, TEM and microcalorimetry results suggest that the formation of well crystallized W2C phase, the restraining of the carbon deposition, as well as the prohibiting of the methanation should be responsible for the high activity and stability of the WC x /AC-H catalyst in the hydrazine decomposition reaction. 相似文献
3.
4.
The objective of the present work was to study the catalytic reformation of methane in presence of carbon dioxide on activated
carbon-supported nickel and calcium catalysts. Results are very promising ones because they suggests that it is possible to
transform methane on these catalysts by using mild reaction conditions. 相似文献
5.
6.
活性炭负载磷钨酸催化合成三羟甲基丙烷三丙烯酸酯 总被引:18,自引:0,他引:18
制备了负载型磷钨酸催化剂 ,发现 PW/ C的催化活性比 PW/ Si O2 和 PW/ Ti O2 高。以 PW/C作为丙烯酸与三羟甲基丙烷的酯化催化剂 ,在丙烯酸 0 .78mol、三羟甲基丙烷 0 .2 5mol、催化剂用量约为反应物总量的 0 .7% (质量分数 )、反应温度 1 2 0°C,反应时间 60 min的条件下 ,酯化率达94.6% ,产品纯度 >98% ,并且催化剂可多次使用活性没有明显下降。 相似文献
7.
活性炭固载磷钨酸催化合成丙酸丁酯 总被引:19,自引:0,他引:19
以活性炭固载磷钨酸为催化剂 ,甲苯为带水剂 ,实现了丙酸与正丁醇反应合成丙酸正丁酯。最佳合成条件为 :酸醇比为 1∶1.2 ,带水剂用量为 10ml,催化剂用量 1.5g ,反应时间为 2 .5h ,产率可达 99.2 %。重复试验表明 ,催化剂重复使用多次对实验结果无太大的影响 相似文献
8.
以活性炭固载对甲苯磺酸为催化剂,用柠檬酸合成了柠檬酸三丁酯,考察了反应时间,酸醇比,催化剂用量对酯化率的影响。确定了最佳的工艺条件,以0.3mol的柠檬酸为基准n(柠檬酸):n(正丁醇)=1:4,T=110-140℃,t=3h,M(催化剂)=1.0G,酯化率≥99%,催化剂可回收重复使用。 相似文献
9.
活性炭负载磷钨酸催化合成己二酸二正丁酯的研究 总被引:1,自引:0,他引:1
采用浸渍法制备的活性炭负载的磷钨酸(HPW/C)催化剂催化合成己二酸二正丁酯.运用红外光谱(IR)、NH3-程序升温脱附、BET法等测试技术进行了HPW/C催化剂的表征.考察了磷钨酸负载量、活化温度、催化剂用量等对催化剂活性的影响;优化的合成己二酸二正丁酯工艺条件为:35% HPW/C催化剂活化温度为110℃;己二酸与正丁醇的摩尔比为1:4.4(mol);35% HPW/C催化剂用量为8 g(每mol己二酸投料计);回流反应时间4.5 h.在此优化条件下,己二酸二正丁酯的收率达89.6%~91.2%,产品含量达99.5%~99.8%. 相似文献
10.
11.
A novel method dispersing nickel in fine particles on activated carbon (AC) was proposed in this study. The nickel particles with 2.2 nm average diameter supported on AC were obtained through re-dispersing the nickel particles by treating with methyl iodide under atmospheric pressure. High dispersion of nickel particles promoted the activity for methanol vapor-phase carbonylation over Ni/AC catalyst. 相似文献
Graphical Abstract
12.
以兰炭为原料,采用物理化学法制备了兰炭基活性炭,以钛酸丁酯、硝酸铁为主要试剂并采用泥浆法制备了不同煅烧温度的Fe3+-TiO2/AC复合材料,并将其用于光催化降解酸性橙溶液,考察了反应时间、催化剂用量、酸性橙初始质量浓度、溶液pH及光源功率对其光催化性能的影响.结果表明:制备的兰炭基活性炭具有发达的孔隙结构和良好的吸附性能,以其为载体制备的Fe3+-TiO2/AC复合材料在光降解时间为3 h、催化剂用量为0.8 g、酸性橙初始质量浓度为40 mg?L-1、溶液pH值为9、光源功率为650 W的条件下,酸性橙溶液降解性能最好,降解率达到96.8%.该研究成果对兰炭制备活性炭应用于TiO2光降解实验的研究具有一定的指导意义. 相似文献
13.
14.
Catalytic Activity of Ruthenium Nanoparticles Supported on Carbon Nanotubes for Hydrogenation of Soybean Oil 总被引:1,自引:0,他引:1
Shanshan Guo Kong Yong Liew Jinlin Li 《Journal of the American Oil Chemists' Society》2009,86(12):1141-1147
Ruthenium catalysts supported on multiwalled carbon nanotubes (MCNTs) with different loadings (1% wt, 3% wt, 5% wt) were prepared
by reduction with H2 or NaBH4 for selective hydrogenation of soybean oil at 338 K and initial pressure of 1.066 MPa. These catalysts were characterized
using transmission electron microscopy (TEM), X-ray powder diffraction (XRD), N2 adsorption–desorption, and H2-temperature programmed desorption (TPD) techniques. Ru particles were dispersed more homogeneously on the surface of the
nanotubes after being reduced with H2 than with NaBH4. The catalysts with 3% and 5% Ru loadings had higher hydrogenation activity. The NaBH4-reduced catalyst had higher cis-isomer selectivity. 相似文献
15.
16.
17.
研究了硫化温度、时间、气氛和原料投入比等对水相条件下Pd/C与Na2S反应的影响规律,合成出一系列具有不同硫化钯晶相的炭载硫化钯催化剂;以N-苯基对苯二胺的N-还原烷基化合成N-(l,3-二甲基丁基)-N’-苯基对苯二胺(6PPD)为探针反应考察了该系列炭载硫化钯的催化性能。研宄发现,硫化温度和气氛是影响所合成的炭载硫化钯晶相结构的重要因素:随着硫化温度的升高(30~250℃),在H2氛围下,只能形成Pd4S晶相;而在凡氛围下,却可合成出较高硫钯原子比的硫化钯晶相,如Pd4S-Pd3S和Pd4S-Pd3S-Pd16S7-Pd S等。不同晶相的炭载硫化钯表面Pd原子的缺电子程度不同,从而表现出不同的催化性能。其中,在120°C、H2氛围下合成的Pd-Pd4S/C催化剂表现出最好的催化选择性96.4%)和稳定性。 相似文献
18.
19.
采用灼烧法预处理、丁二酮肟重量分析法来测定载镍碳纳米管的载镍量,获得稳定而准确的分析结果。结果表明,制备载镍碳纳米管催化剂时所加入的镍并不全部吸附在碳纳米管上;载镍效率随着碳纳米管载镍量的增加而降低。 相似文献