硝酸工业用铂合金催化网材料的技术进展

介绍了生产硝酸用铂合金催化网材料的技术进展。多元化,节铂,强化是当前铂合金催化材料的发展趋势,用高钯,金,钌等代铂,引用载铂催化剂等技术取得一定进展。用非铂合金与铂合金催化网配套使用,可节铂50％左右,用Pd,Au,Ru对铂合金进行固溶强化,在二元,三元催化网中加RE,使铂合金催化网的高温强度及抗蠕变性得到很大提高,形成新的催化铂合金。     

经编二元网在双加压法硝酸装置的应用

通过对双加压法硝酸装置铂网使用情况和铂网脱边事故的统计，分析了氧化炉采用平编三元网存在的问题；论述了经编二元网的特性和优点；计算了铂网的生产强度和接触时间，确定了铂网丝径；总结了硝酸装置使用经编二元网的运行效果和经济效益，结果表明，吨酸氨耗降低了2．48kg，铂耗降低了10mg，经编二元网优于平编三元网。     

硝酸铂催化网的生产与使用技术进展

介绍了铂网的编织技术及各种型号铂网的特点,分析了我国铂网使用中存在的问题,阐述了铂回收的重要性及FTC催化系统的特点。     

用于氨氧化反应的经编铂铑网催化剂

新型经编铂铑网具有接触面积大，铑损失量小，铂损耗低，使用寿命长，机械强度大等特点，取代平编铂铑网催化氨氧化反应，使氨空比增大，硝酸生产能力提高，且消耗少，成本低，安装检修方便，经济效益良好。     

铂铑网及铂铑网灰中铬的原子吸收光谱分析

建立了用空气-乙炔火焰原子吸收光谱分析铂铑网及铂铑网灰中铬的分析方法。研究了样品的处理，样品处理液中共存元素的干扰和抑制。该方法灵敏度高、准确度好，在最佳实验条件下，测定铂铑网及铂铑网灰中铬的最小检测限为0．1μg／g，变异系数≤1％，加标回收率为93％～98％。     

分光光度法测定铂网灰中铂含量

以氯化亚锡作显色剂,用分光光度法测定铂网灰中的铂,当选择合适实验条件的情况下,铂的测定准确度、重复性较高,校准曲线的相关系数大于0．999,精密度较好,定量测定范围0～50μg／kg,应用本方法测定废铂网灰中的铂,方法简便快捷,并具有良好的选择性,结果令人满意。     

不溶性阳极—钛网镀铂的研制

前言高效不溶性钛网镀铂阳极具有极好的导电性,化学和电化学稳定性;耐蚀性强,机械强度和催化活性高;选择性、实用性好;真实表面积大,且价格合理.钛网镀铂具有的这些特性不仅是石墨阳极、不锈钢阳极所不及的,而且以其经济实用而取胜于金、铂等贵金属不溶性阳极.因此在电化学法制备无机、有机产品;电子工业的贵金属电镀;冶金工业;工业废水处理等领域得到广泛应用.本文主要介绍了用氨基磺酸-铂盐工艺制备钛网镀铂不溶性阳极.     

硝酸装置铂网问题及解决

我公司硝酸装置是全国 1 1个大型硝酸生产装置之一 ,年产量 2 0万 t。随着我国加入 WTO和西部大开发进程的不断深入 ,节能降耗、降低生产成本、提高硝酸产品市场竞争力 ,关系到企业的生死存亡。而硝酸生产的核心设备之一——氧化炉铂网的经济运行 ,是节能降耗的重中之重。1　铂网基本情况1 .1　反应原理合成氨在铂催化作用下 ,与空气中的氧反应生成一氧化氮和水。反应式如下 :4NH3 +5O2Pt80 0～ 85 0℃ 4NO+6 H2 O1 .2　铂网为提高氨的转化率及降低铂的损耗 ,铂催化剂的物理形状需满足以下几个条件 :1单位重量的接触表面积要大 ;2催化…     

对双加压硝酸装置氧化炉减少铂网层数的探讨

本文通过对不同条件下铂网燃氨强度的计算和铂网的实际使用情况分析，认为双加压硝酸装置在使用三元网时，每台氧化炉减小一张铂网是可行的。     

对氧化炉中铂网产生裂纹的探讨

对氧化炉中铂网产生裂纹的探讨朱明超（新疆化肥厂乌鲁木齐乌拉泊，８３００９１）我厂硝接车间采用的是综合法生产稀硝酸工艺，每台氧化炉中装有３张直径为２８７５ｍｍ的铂网。近两年来，３”、４”氧化炉中的铀网产生了严重的裂纹，致使氧化率下降，铂网消耗明显上升，...     

钯回收网在双加压硝酸装置上的应用

本文介绍了山西化肥厂双加压硝酸装置铂网及钯回收网的使用情况，并对钯回收网的应用进行了分析。     

铂网的结构和成份对中高压法硝酸生产的影响

介绍了硝酸生产用催化剂－铂网的结构和成份及其对催化性能的影响，并结合实际，指出了中，高压硝酸装置应选择针织二元网。     

硝酸工业用铂合金催化网技术进展

阐述了硝酸生产用铂合金催化网综合技术的趋势与发展,包括铂合金催化网材料、铂合金催化网加工制造技术、应用技术及分析技术的发展。     

氨氧化铂合金网催化剂进展

本文介绍了氨氧化制硝酸用铂合金网催化剂的最新进展。以把部分取代铂是改变组分方面主要动向。编织技术方面经编显示出众多优点,是催化网织造技术的重大革新。本文还给出使用和铂尘回收技术的改进与提高。     

新型铂网托架及支撑结构组成的氨氧化炉技术

介绍新型铂网托架既催化剂筐及支撑结构组成的硝酸装置用氨氧化炉技术。该技术的优点：托架材料选用铸造高温合金,长期使用不会高温氧化,结构设计合理、抗弯曲、制造难度小;完全满足铂网安装和新增减排N2O催化剂装填需要,保证其达到设计使用寿命;使用寿命远高于国外专利商配套提供的产品且节省投资,无维修设计,减少系统停车检修时间,降低维修费用;减少氧化炉的散热损失。     

Partial oxidation of methane over platinum metal gauze

The partial oxidation of methane to synthesis gas has been studied over a platinum gauze catalyst. The experiments were carried out at atmospheric pressure with a single gauze in a quartz reactor heated in an electric furnace. The furnace temperature was varied in the range 200–900°C and the space time in the range 0.00021–0.00042 s. The feed consisted of a mixture of CH₄O₂Ar2110 and carbon oxides and water were the main products. Oxygen was only partly consumed and relatively small amounts of hydrogen were formed.     

Rational modeling of the CPO of methane over platinum gauze: Elementary gas-phase and surface mechanisms coupled with flow simulations

The high-temperature catalytic partial oxidation of methane (CPOM) over a platinum gauze reactor was modeled by integrating 3D numerical simulations of the flow field coupled with heat transport as well as detailed micro-kinetic models including gas-phase and surface reaction mechanisms. Model results describe well CPO experiments over Pt-gauzes in the literature. The conversions of CH₄ and O₂ increase with an increased contact time and were constant in the temperature range of 1000–1200 K. The selectivity to CO linearly increases with temperature. H₂ was only observed above 1200 K, below this temperature H₂O was the only hydrogen-containing product. The contribution of heterogeneous steps in the overall process is prominent, but in the later stages of the reactor, gas-phase reactions become important at certain conditions of temperature, pressure and residence time. Simulations predicted significant gas-phase production of ethane and ethylene via methane oxidative coupling upon increasing the total pressure and residence time. Consequently, homogeneous and heterogeneous processes should be simultaneously implemented in order to accomplish a solid reactor modeling.     

Preparation of Highly Dispersive Platinum Catalysts Impregnated on Titania-Incorporated Silica Support

Highly dispersive silica-impregnated platinum catalysts were prepared by incorporating titania to the surface of silica support and by treating the impregnated platinum precursor with hydrogen peroxide. High dispersion of platinum on the titania-incorporated silica support was confirmed by XRD, TEM, EXAFS, and X-ray photoelectron spectroscopy (XPS) techniques. The platinum particles dispersed on silica ranged from 1 to 2 nm in size, although the loading amount of platinum was as high as 4 wt.%. The strong interaction between platinum and titania suppressed the migration and aggregation of the platinum particles on the surface, retaining a high dispersion of platinum. The platinum catalysts impregnated on the titania-incorporated silica showed higher catalytic activities in the combustion of methane than the platinum catalysts impregnated on the silica, while their catalytic activities were poor in the hydrogenation of nitrobenzene. Platinum dispersions and catalytic activities of the platinum catalysts on the silica support were discussed in relation to the strong interaction between platinum and titania.