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1. 发明授权

US5278124A Low pressure drop, high surface area ammonia oxidation catalyst 失效
标题翻译：低压降，高表面积氨氧化催化剂
公开(公告)号：US5278124A
公开(公告)日：1994-01-11
申请号：US917385
申请日：1992-07-23
申请人： William A. Hochella , Steven A. Heffernen
发明人： William A. Hochella , Steven A. Heffernen
IPC分类号： B01J23/40 , B01J35/06 , C01B21/26 , B01J23/66 , B01J23/72 , B01J23/89
CPC分类号： C01B21/265 , B01J23/40 , B01J35/06
摘要： This invention is a catalytic element for use in the catalytic oxidation of ammonia. The element comprises a foraminous structure fabricated from a material consisting essentially of a metal selected from the group consisting of platinum, rhodium, palladium and alloys of mixtures thereof characterized by (a) a novel configuration whereby the initial product of the formula: curve to the flat ratio (C/F) multiplied by mesh count in inches (N) and wire diameter (d.sub.W), for said element is at least about 0.08 and (b) where, for a given hydrogen throughput, the conversion efficiency is a function of the curve to flat ratio (C/F), wire diameter (d.sub.W) and mesh count (N) combination and conversion efficiency is improved by increasing the mesh count (N) for a given wire diameter, increasing the wire diameter (d.sub.W) for a given mesh count, and increasing the curve to flat ratio (C/F) to a ratio of above 1.0. Preferably the initial product of the formula is greater than 0.2, more preferably 0.9 and the curve to flat ratio (C/F) is above about .pi./2. The preferred initial product of the formula is in the range of from 0.08 to about 10 and more preferred from about 0.9 to about 10. The preferred element is woven gauze, knitted fabric, fibers and combinations thereof. The element can be in a series of said elements as a plurality of screens.
摘要翻译：本发明是用于氨催化氧化的催化元素。该元件包括由基本上由选自铂，铑，钯和其混合物的合金组成的组中的金属组成的材料制成的多孔结构，其特征在于（a）新颖的构型，其中下式的初始产物：曲线与对于所述元件，扁平比率（C / F）乘以网格计数（N）和线径（dW））为至少约0.08，并且（b）对于给定的氢通量，转换效率是通过增加给定丝直径的网格数（N），提高曲线平坦比（C / F），线径（dW）和网格数（N）组合和转换效率，增加线径（dW）给定的网格数，并将曲线平坦比（C / F）增加到1.0以上的比例。优选地，式的初始产物大于0.2，更优选为0.9，曲线与平坦比（C / F）高于约（pi）/ 2。优选的下式的初始产物为0.08至约10，更优选为约0.9至约10.优选的元素是织造纱布，针织物，纤维及其组合。该元件可以是一系列所述元件作为多个屏幕。

2. 发明授权

US5122185A Low pressure drop, high surface area platinum recovery system in a nitric acid plant 失效
标题翻译：低压降，高表面积铂回收系统在硝酸厂
公开(公告)号：US5122185A
公开(公告)日：1992-06-16
申请号：US716548
申请日：1991-06-17
申请人： William A. Hochella , Steven A. Heffernen
发明人： William A. Hochella , Steven A. Heffernen
IPC分类号： B01J38/00 , C01G55/00 , C22B11/00 , C22B11/02
CPC分类号： C22B11/028 , Y02P10/214
摘要： This invention is a method for the recovery of precious metal selected from the group consisting of platinum and rhodium lost from a platinum-containing catalyst during ammonia oxidation processes at a temperature above 850.degree. C. which comprises bringing said lost precious metal into contact with a foraminate element fabricated from a material consisting essentially of palladium, by itself, or palladium and a minor amount of another metal selected from the group consisting of other platinum group metals, Ni, Au, Mn, Mg, Cr, C, B, Cu and alloys of mixtures thereof characterized by (a) a novel configuration whereby the initial product of the formula: curve to flat ratio (C/F) multiplied by mesh size (N) and wire diameter (d.sub.w), for the element is greater than at least about 0.9 and (b) where, for a given nitrogen throughput, the weight recovery efficiency is a function of the curve to flat ratio (C/F), wire diameter (d.sub.w) and mesh size (N) combination and weight recovery efficiency is improved by increasing the mesh size (N) for a given wire diameter, increasing the wire diameter (d.sub.w) for a given mesh size, and increasing the curve to flat ratio (C/F) to a ratio of above about .pi./2. Preferably, the initial product of the formula is in the range of from about 0.9 to about 10. The element is preferably selected from the group consisting of woven gauze, knitted fabric, fibe and combinations thereof. It is preferred that the element consist essentially of palladium by itself or palladium alloyed with one or more metals selected from the group consisting of nickel, cobalt, platinum, ruthenium, iridium, gold, silver and copper.

3. 发明授权

US5356603A Method for the production of hydrocyanic acid using a corrugated catalyst 失效
标题翻译：使用波纹催化剂生产氢氰酸的方法
公开(公告)号：US5356603A
公开(公告)日：1994-10-18
申请号：US9348
申请日：1993-01-26
申请人： William A. Hochella , Steven A. Heffernen
发明人： William A. Hochella , Steven A. Heffernen
IPC分类号： B01J23/40 , B01J35/06 , C01C3/02 , C01C3/14
CPC分类号： B01J35/06 , B01J23/40 , C01C3/0216
摘要： This invention is a method for producing hydrocyanic acid by using an element which comprises a foraminous structure fabricated from a material consisting essentially of a metal selected from the group consisting of platinum, rhodium, palladium and alloys of mixtures thereof characterized by (a) a novel configuration whereby the initial product of the formula: curve the flat ratio (C/F) multiplied by mesh size (N) and wire diameter (d.sub.w), for said element is greater than at least about 0.08 and (b) where, for a given methane and ammonia throughput, the conversion efficiency is a function of the curve to flat ratio (C/F), wire diameter (d.sub.w) and mesh size (N) combination and conversion efficiency is improved by increasing the mesh size (N) for a given wire diameter, increasing the wire diameter (d.sub.w) for a given mesh size, and increasing the curve to flat ratio (C/F) to a ratio of above 1.0. Preferably the initial product of the formula is greater than 0.2 and the curve to flat ratio (C/F) is above 1.0, most preferably above about .pi./2. The preferred initial product of the formula is in the range of from 0.08 to about 10 and more preferred from about 0.2, most preferred 0.9, to about 10. The preferred element is woven gauze, knitted fabric, fibers and combinations thereof. The element can be in a series of said elements as a plurality of screens.
摘要翻译：本发明是通过使用包含由主要由选自铂，铑，钯及其混合物的合金组成的组成的材料制成的材料制成的多孔结构的元素来制造氢氰酸的方法，其特征在于（a）新颖的配置，其中以下公式的初始产物：对于所述元件曲线平坦比（C / F）乘以网孔尺寸（N）和线径（dw），大于至少约0.08和（b）其中，对于给出甲烷和氨的产量，转化效率是曲线平坦比（C / F），线径（dw）和网格尺寸（N）组合的函数，通过增加网格尺寸（N）来提高转换效率给定的丝线直径，增加给定网眼尺寸的线径（dw），并将曲线增加到平坦比（C / F）至高于1.0的比率。优选地，式的初始产物大于0.2，曲线平坦比（C / F）大于1.0，最优选高于约π/ 2。式的优选初始产物在0.08至约10的范围内，更优选约0.2，最优选0.9至约10.优选的元素是织造纱布，针织物，纤维及其组合。该元件可以是一系列所述元件作为多个屏幕。

4. 发明授权

US5160722A Low pressure drop, high surface area ammonia oxidation catalyst 失效
标题翻译：低压降，高表面积氨氧化催化剂
公开(公告)号：US5160722A
公开(公告)日：1992-11-03
申请号：US716539
申请日：1991-06-17
申请人： William A. Hochella , Steven A. Heffernen
发明人： William A. Hochella , Steven A. Heffernen
IPC分类号： B01J23/40 , B01J35/06 , C01B21/26
CPC分类号： C01B21/265 , B01J23/40 , B01J35/06
摘要： This invention is a catalytic element for use in the catalytic oxidation of ammonia. The element comprises a foraminous structure fabricated from a material consisting essentially of a metal selected from the group consisting of platinum, rhodium, palladium and alloys of mixtures thereof characterized by (a) a novel configuration whereby the initial product of the formula: curve the flat ratio (C/F) multiplied by mesh count in inches (N) and wire diameter (d.sub.w), for said element is greater than at least about 0.08 and (b) where, for a given hydrogen throughput, the conversion efficiency is a function of the curve to flat ratio (C/F), wire diameter (d.sub.w) and mesh count (N) combination and conversion efficiency is improved by increasing the mesh count (N) for a given wire diameter, increasing the wire diameter (d.sub.w) for a given mesh count, and increasing the curve to flat ratio (C/F) to a ratio of above 1.0. Preferably the initial product of the formula is greater than 0.2, more preferably 0.9 and the curve to flat ratio (C/F) is above about .pi./2. The preferred initial product of the formula is in the range of from 0.08 to about 10 and more preferred from about 0.9 to about 10. The preferred element is woven gauze, knitted fabric, fibers and combinations thereof. The element can be in a series of said elements as a plurality of screens.
摘要翻译：本发明是用于氨催化氧化的催化元素。该元件包括由基本上由选自铂，铑，钯及其混合物的合金组成的组中的金属组成的材料制成的多孔结构，其特征在于（a）新颖的构型，其中下式的初始产物：弯曲平面对于所述元件，乘以网格计数（N）和线径（dw）的比率（C / F）大于至少约0.08和（b）对于给定的氢吞吐量，转换效率是函数通过增加给定线径的网格计数（N）来提高曲线平坦比（C / F），线径（dw）和网格计数（N）组合和转换效率，增加线径（dw）对于给定的网格计数，并且将曲线增加到平坦比（C / F）至高于1.0的比率。优选地，式的初始产物大于0.2，更优选为0.9，曲线与平坦比（C / F）高于约π/ 2。优选的下式的初始产物在0.08至约10的范围内，更优选约0.9至约10.优选的元素是织造纱布，针织物，纤维及其组合。该元件可以是一系列所述元件作为多个屏幕。

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