STUDIES ON FISCHER TROPSCH SYNTHESIS OVER Fe-Cu-K CATALYST Ⅰ.CATALYTIC PERFORMANCE

The influence of reaction pressure, temperature, space velocity (GHSV), particle size of catalyst and H2/CO ratio of feed-gas on the steady-state product distribution, conversion of CO, H2 and syngas, olefin to paraffin ratio and CO2/ H2O ratio for FTS reaction were investigated using a coprecipitated copper- potassium promoted iron catalyst. The test was carried out in a fixed-bed reactor. Increasing the reaction temperature from 493. 2 to 5-13. 2 K shifted the hydrocarbon distribution toward the heavier hydrocarbons (C5-C23) and selectively increased CO conversion to CO2. The hydrocarbon distribution was found to be dependent on the H2/CO feed-gas ratio in the range from 1.23 to 2. 22. The CO2/H2O ratio in product decreased as the flow of feed-gas rate increased, which suggests that H2O is a primary product and its reaction with CO to form CO2 occurs via a secondary process. The CO conversion increased with the decrease of catalyst particle size from 10 to 60 mesh (2. 0- 0. 3 mm), while the CO convers     

STUDIES ON PRECIPITATED Cu-BASED CATALYST FOR METHANOL SYNTHESIS IL CATALYST COMPOSITION AND PREPARATION PROCESS

Several series Cll-based catalysts prepared by one-step parallelflow coprecipitation or tow-step coprecipitation methods were investigated. The results mainly indicate that the optimum Cu/Zn ratio changes withpreparation method. Both the optimum Cu/Zn ratio and the activity of thecatalyst prepared by the former are higher than those of tbe catalyst preparedby the latter. which can be explained by their XRD patterns. When calcinedat high temperature. the catalyst shows very poor activitv. which is discussedin detail. Adding MnO_2 to the catalyst Cu-ZnO-Al_2O_3. the thermal stability is improved greatly. while adding CdO, the activity declines.     

FISCHER－TROPSCH SYNTHESIS OVER ZrO＿2－SUPPORTED Ru－FeBIMETALLIC AND THEIR MONOMETALLIC CLUSTERS

ＦＩＳＣＨＥＲ－ＴＲＯＰＳＣＨＳＹＮＴＨＥＳＩＳＯＶＥＲＺｒＯ＿２－ＳＵＰＰＯＲＴＥＤＲｕ－ＦｅＢＩＭＥＴＡＬＬＩＣＡＮＤＴＨＥＩＲＭＯＮＯＭＥＴＡＬＬＩＣＣＬＵＳＴＥＲＳ￥ＺｈｏｎｇＲｕＧＵＯ；ＨｕｉＺｈｅｎＸＵ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉ...     

SURFACE COMPOSITION AND OXIDATIVE COUPLING OF METHANE OVER Sm-Li-MgO CATALYST

The surface composition of Sm-Li-MgO catalysts and their behaviorin OCM have been investigated using the kinetic method,XRD and XPS.Wediscovered that lithium played an important role in the activity and C_2(C_2H_4+C_2H_6)selectivity of catalysts.The major reasons for catalyst deactivation arethe loss of lithium and the transformation of catalysts during the period ofreaction.     

STUDIES ON PRECIPITATED Cu-BASED CATALYST FOR METHANOL SYNTHESIS L REACTION CONDITION AND REDUCTION PROCESS

A series of precipitated CuO-ZnO-Al_2O_3 catalysts for methanolsynthesis have been prepared and their catalytic activities under differentreaction conditions(temperature,pressure,space velocity)have been tested.By means of TPR,TG,the reduction behavior of typical catalyst sample andbinary sample CuO-Al_2O_3 was comparatively investigated.The resultsindicate that the autocatalysis in reduction process of Cu-based catalystcorrelates with the CuO crystallinity.     

THE SYNTHESIS AND STUDIES ON PALLADIUM CATALYSTS ANCHORED ON CHELATE RESIN

A chelate resin with 8-aminoquinoline group attached to a styrene-divinybenzene copolymer matrix was reacted with PdCl_2, forminga polymeric palladium complex, which was reduced with different reducing agents, such as hydrogen, stannous chloride, sodium borohydride, lithium aluminum hydride, hydrazine and basic aqueous methanolic solution and thus the polymer-supported palladium (Ⅱ) complex, colloidal palladium and palladium complex with different valence states were obtained. The hydrogenation of n-hexene in methanol at 40℃ under atmospheric hydrogen pressure and the selective hydrogenation of 1,5,9-cyclododecatriene at 100℃ under 20 kg/cm~2 hydrogen pressure were studied. The results showed that the palladium complexes With different valence states prepared with hydrazine or methanol-water (pH=11) were effective catalysts for the hydrogenation of olefins. The loss of palladium on catalysts was correlated to the palladium dispersion and valence states. It was found thst the loss of palladium decreas     

STUDIES ON THE PRENYLFLAVONOIDS PARTⅡ.SYNTHESIS OF EUCHRENONE A_7

Euchrcnonc a_7 has been prcparcd by condensation of 2-hydroxy-4-mcthoxy-3-prcnylacctophcnone with 2,4-dimethoxymethoxybenzaldehyde followed by cyclization anddemethoxymethylation.     

STUDIES ON THE SYNTHESIS OF SINULARIOE-D,SINULARIAL-A AND SINULARIC ACID-A

A precursor 12 of sinulariol-D,sinularial-A and sinularic acid-A(marinecembranoids)was prepared from geraniol through nine steps     

STUDIES ON THE SYNTHESIS AND DNA-BINDING ABILITY OF ZINC FINGER MOTIF

ＳＴＵＤＩＥＳＯＮＴＨＥＳＹＮＴＨＥＳＩＳＡＮＤＤＮＡ－ＢＩＮＤＩＮＧＡＢＩＬＩＴＹＯＦＺＩＮＣＦＩＮＧＥＲＭＯＴＩＦ￥ＸｉａｏＹｕＨＵ；ＲｕｉＷＡＮＧ；ＸｉａｎｇＱｕｎＬＩ（ＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏｆＡｐｐｌｉｅｄＯｒｇａｎｉｃＣｈｅ...     

COS对FT合成催化性能的影响

在５２４Ｋ、２．３１ＭＰａ和１８４５ｈ＾－１条件下，考察了合成气（Ｈ２／ＣＯ＝２．１）中ＣＯＳ浓度分别为５１．４、１２８．８、１６２．７和２４５．６ｐｐｍ对Ｆｅ－Ｃｕ－Ｋ工业催化剂ＦＴ合成催化性能的影响。实验表明，催化剂预先中毒比在线中毒速度快。大颗粒催化剂的抗硫能力比小颗粒催化剂强。催化剂ＦＴ合成失活速率与ＣＯＳ浓度有关，即高浓度条件下，催化剂的失活速率快。当温度为５２４Ｋ时，催化剂的失活速率最     

浆态床FT合成／固定床ZSM－5改质的合成液体燃料工艺的研究和开发

从合成气制取液体燃料的浆态床ＦＴ合成／固定床２ＳＭ－５改质的反应系统由Ⅰ段鼓泡浆液反应器（内径４０ｍｍ，高４５０Ｏｍｍ）和Ⅱ段固定床ＺＳＭ－５反应器（内径４０ｍｍ，高９００ｍｍ）组成，在温度２５０～２８０℃（Ⅰ段），３００～３４０℃（Ⅱ段），压力１．５～２．５ＭＰａ，空速２．０ＮＬ／ｇＦｅ·ｈ（Ⅰ段），５００～１０００ｈ￣－１（Ⅱ段），Ｈ＿２ＣＯ比０．５～１．５和气速１～２ｃｍ／ｓ范围内，考察了工艺参数对反应性能的影响，１０００ｈ以上的寿命试验的平均结果为：合成气单程转化率６５．１％，产率１００ｇ／Ｎｍ￣３（Ｃｏ＋Ｈ＿２），总烃生产达３５０ｇ／Ｆｅ。使用富ＣＯ合成气时，达１１０ｇ／Ｎｍ￣３（ＣＯ＋Ｈ＿２）。实测的ＦＴ合成反应热为２９３８；５ｋＪ／Ｎｍ￣３（ＣＯ＋Ｈ＿２）。长期运转试验表明，工艺流程合理，设备操作和温度控制可靠。采用的浆液循环回路方法可初步分离蜡中的催化剂。     

浆态搅拌釜中FT合成的动力学研究

在自制的５００ｍｌ浆态搅拌器采用模试鼓泡浆反应器无载体沉淀Ｆｅ－Ｃｕ－Ｋ催化剂进行了ＦＴ合成动力学研究。在２５０－２８０℃，１．５ＭＰａ，１－２．５１／ｇｌａｔ．ｈ和Ｈ２／ＣＯ＝１．０９范围内，排除传质效应的条件下，得到了本征动力学数据，实验结果用线性参数估计方法按照速率常数ｋ，活化能Ｆ     

固定床F -T合成Fe -Cu -K催化剂3000小时模试（英文）

进行了两段法F -T合成 (MFT)Fe -Cu -K催化剂 3 0 0 0小时模试 ,考察了工艺改进后的适应性 ,催化剂稳定性及其影响因素。结果表明 ,CO转化率达到了 75～ 85 %,烃选择性达 78～ 94 %,C 5产率达 85～ 1 1 0g/NM3(CO H2 )。     

α-TETRADECENE COFEEDIG EFFECT ON THE SUPERCRITICAL-PHASE FISCHER-TROPSCH SYNTHESIS OVER Co/SiO_2 CATALYSTS

以Ｃｏ／ＳｉＯ２为催化剂在固定床反应器中进行了超临界ＦｉｓｈｅｒＴｒｏｐｓｃｈ合成，同时考察了αＣ１４烯共进料对该反应的影响。结果表明，所添加的αＣ１４烯可以借助超临界流体到达催化剂的表面参与链增长过程，但不同于原始的链传递。还发现，Ｃ１４烯的加入可以明显提高Ｃ１４烃的得率，而Ｃ１Ｃ１３烃的选择性则相应降低，使得产物烃的分布偏离ＡＳＦ动力学。另一方面，从产物蜡的分析结果可以看出，蜡的平均分子量和饱和度都在增加，其中含氧化合物的含量随着Ｃ１４烯的加入而减少。     

片状催化剂F-T合成宏观动力学

采用固定床积分反应器,在工业条件下,对压片Ｆｅ－Ｃｕ－Ｋ催化剂进行了Ｆ－Ｔ合成宏观动力学考查。在稳态下,用集总的方法,在保持一定的轴向温度分布及取其平均温度条件下,求得两组宏观动力学方程,两者分别与实验数据吻合较好,同时两者之间也存在较好的一致性。     

Fe—Cu—K催化剂上费托合成反应的研究

通过一系列实验,研究了固定床中工业ＦｅＣｕＫ催化剂上费托合成反应的规律。结果表明,反应温度、压力、原料气Ｈ２／ＣＯ等操作条件影响费托反应转化率、产物分布和产物的收率。随着操作温度（５０３～５４３Ｋ）的升高,ＸＣＯ＋Ｈ２、Ｃ１＋、Ｃ５＋均有明显的增加,碳氢化合物向轻组分方向偏移,产物中烯／烷比呈有规律的变化;随着压力的升高（１．０～３．０ＭＰａ）,ＸＣＯ＋Ｈ２、Ｃ１＋、Ｃ２＋、Ｃ５增大,轻油（Ｃ２～Ｃ４）的组分含量也有增加趋势,但压力对烯烃、烷烃的选择性影响不同,压力增大产物中烯／烷比下降,有利于烷烃的生成;原料气Ｈ２／ＣＯ比亦较大程度地改变了ＦｅＣｕＫ催化剂上的产物分布和收率,原料气Ｈ２／ＣＯ比（１．０２～２．８３）升高可增大ＸＣＯ,产物中低碳烃含量上升,但Ｃ１＋和Ｃ５＋收率减少。本文还对铁基费托合成催化剂上伴随的水煤气变换反应的变化规律进行了探讨。     

工业固定床Fe-Cu-K催化剂浆态床F-T合成适应性研究

采用连续搅拌釜式反应器,在接近F-T合成实际工况下考察了工业固定床Fe-Cu-K催化剂浆态床F-T合成反应性能,研究反应温度、压力、原料气空速和氢碳摩尔比等操作参数对催化剂反应活性、产物选择性和稳定性的影响,实验总运转时间达2 500 h;同时采用扫描电镜技术（SEM）对催化剂的抗磨损性能进行了研究,结果表明,操作参数对催化剂的活性、选择性和目标产物产率有较大的影响,工业固定床Fe-Cu-K催化剂具有一定的抗磨损性能,F-T合成烃产物分布合理;催化剂具有较高的稳定性,在589 h的稳定条件运行内,催化剂的失活速率为0.23%/d（以CO转化率的降低计）;在整个运行期间CH4选择性维持在较低的水平。     

INVERSE RESPONSE BEHAVIOR OF FIXED-BED REACTOR IN A FISCHER-TROPSCH SYNTHESIS

研究了固定床ＦＴ合成反应器中的动态响应行为。主要研究了当反应器进口气体温度突降后床层中出现的逆响应现象，并探讨了水煤气变换副反应对固定床ＦＴ合成反应器逆响应行为的影响。