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The probability of an [FeOH]+ ion charge compensating an Al-T-site finding another within a suitable distance, r, with which to form an Fe-O-Fe bridged species has been calculated. The result is a function of the iron loading (m) as well as r and the Si/Al ratio (n). The results suggest that with ratios commonly employed (11≤Si/Al≤25) bridge formation is limited, yet may involve an important fraction...
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