STUDIES ON REFORMING NATURAL GAS WITH CARBON DIOXIDE TO PREPARE SYNTHESIS GAS

采用固定床流动反应器和ＸＲＤ、ＴＰＲ等技术对添加了Ｌａ２Ｏ３助剂的Ｎｉ／αＡｌ２Ｏ３催化剂进行了研究。结果表明，经Ｌａ２Ｏ３改性后，催化剂的活性和稳定性得到提高，Ｌａ２Ｏ３的最佳含量为２％（ｗｔ）。脉冲试验结果表明，添加２％（ｗｔ）的Ｌａ２Ｏ３助剂，能够有效抑制甲烷脱氢性能，增加二氧化碳消碳活性。ＴＰＲ结果表明，添加Ｌａ２Ｏ３助剂，能够改变活性组分和载体之间的相互作用，增加镍的分散度，降低氧化镍的还原温度，提高重整反应的活性。     

KINETIC STUDIES ON METHANE REFORMING WITH CARBON DIOXIDE

IntroductionNlcthallcrcforlllillg\\tillf'OZproducest'O-richs}'lltllcslsgas\\hichisuscftllilltileProcessofFicllcr-Tropscllalldo\orcactioll.sllcllastiles}'lltllcscsofaceticacid-dilllctll\'Ictllcralldo.o-aloof,olslI'21111addition.acolllparisolloftheccollolll…     

METHANE REFORMING WITH CARBON DIOXIDE TO PRODUCE SYNGAS?a?aCATALYST REGENERATION

The regeneration conditions of the deactivated catalyst 18wt%NiO/a-A12O3 used in methane reforming with carbon dioxide were studied by using a fix-bed flow reactor and TPR technique. When the deactivated catalyst was reduced at 1 123 K in a conventional regeneration process, the activity increased a little, but was still much lower than that of the fresh catalyst. When the deactivated catalyst was reduced, then treated in site With an activity-rejuvenating agent of 5-10 vo1% C (aqueous hydrogen peroxide solution) and reduced again at 1123K, the activity was renewed to approach that of the fresh one.     

STUDIES OF CATALYTIC PARTIAL OXIDATION OF METHANE TO SYNTHESIS GAS

llltcractlOllIntroductionNaturalgas.oft"hichthemajorconstituentismethane.hasbeenusedtoproduces'.nthcsisgasonalargeindustrialscaleforseveraldecades-mostl}'insteamreformingreaction(SR)t'.hichsuffersfromthedisadvantageofhighHZ/COratio(>4-whichis11otsuitablef…     

REFORMING OF METHANE BY CARBON DIOXIDE Thermodynamic and Catalytic Approaches

ＲＥＦＯＲＭＩＮＧＯＦＭＥＴＨＡＮＥＢＹＣＡＲＢＯＮＤＩＯＸＩＤＥＴｈｅｒｍｏｄｙｎａｍｉｃａｎｄＣａｔａｌｙｔｉｃＡｐｐｒｏａｃｈｅｓＱｕａｎＺｈｕａｎｇ＊，ＨｅｌｍｕｔＰａｐｐ（ＩｎｓｔｉｔｕｔｆüｒＴｅｃｈｎｉｓｃｈｅＣｈｅｍｉｅ，Ｕｎｉｖｅｒ...     

COMBINED PARTIAL OXIDATION AND CARBONDIOXIDE REFORMING OF METHANE PROCESS TO SYNTHESIS GAS

IntroductionIthasbccndcmonstratcdthatmcthancrcformingt"ithcarbondioxidcpr0ducessynthcsisgasrichincarbonmonoxidc-x"hichisuscfulforthcs}nthcsisofaccticacid'dimcthylcthcrando.o-alcoholsll'2].Carbondioxidcref0rmingismorccndothcrmicthanstcamrcformingfCH4 CO2,'2CO 2H2Ai/'2,,=2473kJ..ol-1(l)Accordingl\"thisrcact1onnccdshighcrtcmpcraturcandlimitsspaccvclocityoffccdgas,Wehavcprct'ious1\studicdmcthancrcformingt"lthC02inthcmonotubcproccssl3J.Inordertoconvcrtmcthancinfccdgascomplctcl}',thcspaccvcloci…     

PARTIAL OXIDATION OF METHANE TO SYNTHESIS GAS

This paper has reviewed llic subject on partial oxidation of methane to synthesis gas, mainly on the catalytic partial oxidation (CPO), involving the research history and the present situation, reaction mechanism, catalvsl types and the application prospect with 21 references.     

CH_4 REFORMING WITH CO_2 TO SYNTHESIS GAS

An Ni-RE_2O_3/Al_2O_3 catalyst was used for CH_4 reforming with CO_2.Theinfluence of reaction conditions,such as temperature,space velocity,pressure,CO_2/CH_4 and H_2O/(CO_2+CH_4)ratios on the activity of catalyst was investigated.The re-sults show that CO/H_2 ratio was adjustable and the maximum content of CO reached50% in products which conformed with the composition of thermodynamical equilib-rium.In addition,the effect of carbon deposition on the catalyst upon the activitywas discussed.     

STUDIES ON REFORMING NATURAL GAS WITH CARBON DIOXIDE TO PREPARE SYNTHESIS GAS XI. Effect of La2O3 Promoter on Ni/|á-Al2O3 Catalysts

This paper reports the results of our experiments on the activity and stability of La2O3 promoted Ni/|á-Al2O3 catalysts used in reforming natural gas (or methane) with carbon dioxide under atmospheric pressure by using a fixed bed flow reactor and XRD and TPR techniques. It was showed that the activity and stability of Ni/|á-Al2O3 catalysts modified by La2O3 were higher than that of unmodified one, and the optimum content of La2O3 was 2%(wt).     

STUDIES ON PREPARATION OF GAS FOR METHANOL SYNTHESIS BY METHANE REFORMING WITH STEAM AND CO_2 Ⅱ.ACTIVITY AND STABILITY OF SUPPORTED NICKEL CATALYSTS

lntroductionMethanolissynthesizedbyblendgasofCOandH2.FeedstockgasformethanolsynthesismustbeinlinewiththefollowingstoichiometricrelationtR=(H2-Co2)/(Co CO2)52Inaddition,thecontentofCo2shouldbelowerthan8%ll1.MethanereformingwithsteamandCO2canproducethequalifiedsynthesisgasformethanolsynthesisinindustry.ComParedwithtndtionalsteaInrefotheng,thefeedstocksynthsisgasproducedbymethanreformingwithsteamandCO2docsnotneedseparaingandcanbedirectlyusedinmethanolsynthesis.Therefore,thecostofmethanolca…     

ULTRAFINE CuO-ZnO-SiO_2 CATALYST FOR HYDROGENATION OF CARBON DIOXIDE

ＵＬＴＲＡＦＩＮＥＣｕＯ－ＺｎＯ－ＳｉＯ＿２ＣＡＴＡＬＹＳＴＦＯＲＨＹＤＲＯＧＥＮＡＴＩＯＮＯＦＣＡＲＢＯＮＤＩＯＸＩＤＥ￥ＣｈｉＹａｗｕ；ＬｉａｎｇＤｏｎｇｂａｉ；ＸｕＣｈａｎｇｈａｉ；ＬｉｎＰｅｉｚｉ；ＬｕｏＨｏｎｇｙｕａｎ；ＬｉｎＬｉｗｕ（Ｄａ...     

REACTION OF METHANE WITH CARBON DIOXIDE OVER SrNiAl_(11)O_(19)

合成了六铝酸盐ＳｒＮｉＡｌ１１Ｏ１９并用ＸＲＤ、ＵＶＤＲＳ、ＴＧＤＴＡ和ＴＥＭ等技术对其进行了表征。在７５０℃于ＳｒＮｉＡｌ１１Ｏ１９上进行的甲烷与二氧化碳重整反应表明，这类催化剂较Ｎｉ／ＳｒＡｌ１２Ｏ１９具有较大活性和低积碳能力，在催化反应过程中可有效地抑制Ｎｉ颗粒的增大。     

KINETICS OF DEPOSITION OF METAL IONS TO ACTIVATED CARBON FIBERS（ACFs)WITH FLUIDIZATION

The diffusion and mass transfer, reaction, integration and growth processes of the metalions on the activated carbon fibers (ACFs) are discussed. Based on the diffusion film theory, thediiffusion and the integration model are developed to describe the deposition processes of metal ionsfrom the solution to ACFs in the fiuidized beds. The model of heat transfer of this process isestablished to expound the important role-played in deposition processes by the influence of thereaction heat released at ACFs surface and the non-uniform temperature distribution caused byhydrodynamics.     

SYNTHESIS OF ALCOHOLS FROM HYDROGENATION OF CARBON DIOXIDE(Ⅲ)

The effects of catalyst preparation and reaction conditions on thecatalytic activity and selectivity for hydrogenation of carbon dioxide to alcoholsover zeolite supported bimetal catalyst were studied.The results showed that:(1)ethanol easily formed on the zeolite with larger pores and methanol did onthat with smaller pores;(2)when pH value of the ion exchange solution was10,the activity reached the maximum;(3)the optimum Cu/Ru mole ratio was3;(4)the influence of reation conditions such as temperature,pressure andH_2/CO_2 mole ratio on the topic reaction was greater.     

KINETICS OF DEPOSITION OF METAL IONS TO ACTIVATED CARBON FIBERS (ACFs) WITH FLUIDIZATION

1. INTRODUCTION Study on the deposition of metal ions on ACFs indicated that such a process consists of several consecutive steps [1]: (1) transfer of the solvated ions (metal ions) from the bulk solution to the proximity of the ACFs surface; (2) absorpt…     

PROMOTING EFFECT OF RARE EARTH OXIDES ON Ni/Re_xO_y-Al_2O_3 CATALYST FOR PARTIAL OXIDATION OF METHANE TO SYNTHESIS GAS

IntroductionSynthesisgas(HZ CO)isproducedfrommethanemoshybysteamrefonningwhichsuffersfromlimitationssuchasveryhighenergyrequirements,complicatedequipmentandinstallations,highHZ/COproductratioandpoorselectivityforcarbonmonoxide.Recently,manyresearchershave…     

CONVERSION OF METHANE AND CARBON DIOXIDE TO AROMATICS OVER CHROMIUM-BASED CATALYSTS:SELECTIVITY AND YIELD OF MAIN PRODUCTS

在８４０℃，０．５ＭＰａ，ＣＨ４／ＣＯ２摩尔比为１．４，接触时间（Ｗ／Ｆ）为０．７９ｈ·ｇ·Ｌ－ｌ的条件下，甲烷和二氧化碳在７．５ｗｔ％Ｃｒ／５．０ｗｔ％Ｎａ／ＳｉＯ２催化剂上共活化得到了４．８％的Ｃ２选择性，４８．７％的芳烃选择性及１．９％的芳烃收率。在钠修饰的铬基催化剂上，成功地一步实现了ＣＨ４和ＣＯ２转化为乙烯及中间物乙烯聚合为芳烃的过程     

STUDY OF Cu-Mu CATALYST FOR THE SYNTHESIS OF METHYL FORMATE AND METHANOL FROM SYNTHESIS GAS

将一种新型的ＣｕＭｎ催化剂用于由合成气合成甲酸甲酯和甲醇，该催化剂表现出良好的反应活性和甲酸甲酯选择性。考察了反应温度、合成气压力及催化剂制备方法等对合成甲酸甲酯和甲醇的反应活性及选择性的影响。在反应条件下，产物收率最高达６０．１０ｇ／（Ｌ·ｈ），产物甲酸甲酯的选择性很高。用ＢＥＴ、ＸＲＤ及ＸＰＳＡｕｇｅｒ等测试方法对催化剂的比表面、晶相组成以及铜、锰在催化剂中的价态进行了表征，并探讨了催化剂失活的原因。     

SYNTHESIS OF SPINEL MgAl_2O_4 AS A GOOD CATALYST SUPPORT FOR PARTIAL OXIDATION OF METHANE TO SYNGAS

γＡｌ２Ｏ３ｈａｓｂｅｅｎｉｎｔｅｎｓｉｖｅｌｙｓｔｕｄｉｅｄａｓａｃａｔａｌｙｓｔｓｕｐｐｏｒｔｉｎａｌｋａｎｅｃｏｎｖｅｒｓｉｏｎｄｕｅｔｏｉｔｓｌａｒｇｅｓｕｒｆａｃｅａｒｅａ．Ｈｏｗｅｖｅｒ，ｉｔｉｓｓｕｓｃｅｐｔｉｂｌｅｔｏｃｒｙｓｔａｌ...