Johnson Matthey Chemicals

Chemicals. Synthesis gas, as an equimolar mixture of carbon monoxide and hydrogen, was purchased from either Air Products Ltd or British Oxygen Company Ltd. Ru(acac)3 was purchased from Johnson Matthey Chemicals Ltd and used without further purification Ru3(C0)j2 Rh6(C0)i6 and Rh(C0)2acac were prepared according to literature procedures (10-12). Glacial acetic acid and the various additives/promoters were purchased from BDH Ltd and used without further purification. Tetraglyme (ex-Aldrich Chemical Company Ltd) was dried over activated 3A molecular sieves before use. 

For the spectrometric method, U.S. Geological Survey standard granite G-2 is used as a base for the standard. To 0.5 g portions of G-2 are added 379 mg of Specpure A1203 ( Johnson Matthey Chemicals Ltd., through Jarrell-Ash Division, Fisher Scientific Co., 590 Lincoln St., Waltham, Mass. 02154) to adjust the Si02 Al203 ratio to 3 1 and various amounts of a synthetic standard containing 1000 ppm (w/w) of each of... 

The catalyst was prepared by Johnson Matthey Chemicals pic by an ion-exchange procedure, using SORBOSIL grade AQ U30 silica as support and Pt(NH3)4Cl2 as the source of metal it was reduced in... 

In 2005, De Laeter discussed the role of isotope reference materials for the analysis of non-traditionaT stable isotopes. At present, no isotopically certified reference materials exist for a large number of elements, including Cu, Zn, Mo and Cd, and it is important that this situation be rectified as soon as practicable. Before the isotopically certified reference materials become available for selected elements, suitable reference materials can be created as a standard if sufficient and reliable isotope data have been obtained by interlaboratory comparisons. For example, the Hf/ Hf isotope ratio was measured using hafnium oxide from Johnson Matthey Chemicals, JMC-475, for hafnium isotope ratio measurements with different multi-collector mass spectrometers (ICP-MS and TIMS) as summarized in Table 8.1. However, no isotope SRM is certified for the element Mo either. Mo isotope analysis is relevant, for example, for studying the isotope fractionation of molybdenum during chemical processes or the isotope variation of molybdenum in nature as the result of the predicted double (3 decay of Zr or 18.26-28 spectroscopically pure sample from Johnson Mattey Specpure is proposed as a laboratory standard reference material if sufficient and reliable isotope data are collected via an interlaboratory comparison. 

Johnson Matthey Chemical Ltd. Spectoflux (prefused Borate Fluxes) Manuf... 

Page 131, Chloroiridic acid, read Supplier Johnson Matthey Chemicals Ltd. 

Searles R.A. Johnson Matthey Chemicals, Div. Autocatalysts United Kingdom... 

Commercially available from Johnson Matthey Chemicals as TibreCat . 

Alfa Aesar-Johnson Matthey Chemical and Metal Industries... 

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